背靠背幹葉圖????

Back-to-back stemplot 背靠背幹葉圖
Back-to-back stemplots are used to compare two distributions side-by-side. This type of double stemplot contains three columns, each separated by a vertical line. The center column contains the stems. The first and third columns each contain the leaves of a different distribution. The numbers for the leaves of the distribution in the leftmost column are aligned to the right and are listed in increasing order from right to left. Here is an example of a back-to-back stemplot comparing the distribution in the first example (Set B) to another distribution (Set A).
Set A Set B
------- -------
6 5 3 | 4 |
8 7 6 5 | 5 | 4 6 7 9
7 3 2 | 6 | 3 4 6 8 8
4 2 | 7 | 2 2 5 6
6 | 8 | 1 4 8
| 9 |
| 10 | 6

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